The fourth volume of “History of Central Asia” discusses the history of the rise, development and decline of the Mongols and Turkic Mongols in Central Asia during the nearly three hundred years from the beginning of the 13th century to the end of the 15th century. In terms of content, this book continues to discuss the development of feudal system and feudal relations, which still belongs to the category of medieval history in the staging of world history; in the development stage of feudal society. This volume is divided into three parts: “The Age of the Mongol Empire”, “The Age of the Mongolian Khanate” and “The Age of the Timurid Empire”. The first series began in the early 13th century when the Mongols rose and ended in 1269 when the Taras Conference was held; the second series began in 1270 when the Mongol Empire was split, and finally the Turkicized Mongolian Timur established rule in the Hezhong area. 1370; The third series began in 1370, when the Timurid Empire was established, and finally ended in 1507, when the Timurid Empire fell. The structure of each part is roughly composed of two parts: the first part describes the historical process and rule of the Mongolian or Turkic Mongolian regimes; the second part provides a general overview, summarizing the social economy of the Mongols or the Turkic Mongolians in Central Asia, religion, culture, and foreign relations, summarizing and evaluating Mongolian or Turkic Mongolian regimes.